Tapping-mode Tip-sample Distance Control For Near-field Optical

• Main Authors: Lu, Yuan-Ying, 路洹瀛
• Other Authors: Din Ping Tsai
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/93768757366589847356

碩士 === 國立中正大學 === 物理研究所 === 86 === A tapping-mode tuning fork force sensing method for near-field scanning opticalmicroscope has been successfully developed. Using tuning fork and normalstraight near-field fiber probe, a simple working mechanismof tapping-mode was achieved. Asymmetric construction of mechanical excited tapping-modetuning fork generates better stability and sensitivity than that in shearforce mode or other non-optical method. Resultsshowed the vibration of twotines is out of phase 180 degrees. The attaching of fiber probe only changesthe Q and resonance frequencyof the sensing tine slightly. Force curves ofshear force mode and tapping-mode fiber tip in air or in water demonstratedthat force interaction of tapping-mode is more sensitive and simplified. Stable and clear images of 500 nm standard polystyrene spheres wereobtainedin air or water by this novel method.